短信中心对于发往SP的短信路由是指向哪个实体？（）
A.业务网关
B.互通网关
参考答案：A
When he looked up, he suddenly found himself________by a group of teenagers, ________looked
at him anxiously.[ ]
A. to be surrounded; which
B. surrounded; who
C. be surrounded; who
D. having been surrounded; which
一个C语言程序是由
A) 一个主程序和若干子程序组成 B) 函数组成C) 若干过程组成 D) 若干子程序组成
